a) Color−color diagram of the 580 galaxies in zCOSMOS measured with SUBARU filters. Star e show the galaxies with EW ≥ 80 Å in both Hα and [OIII]. The arrow points in the direction of galaxies with larger EW in both emission lines. The shadowed region in the diagram is the starburst location. b) Color−color diagram for galaxies in the photometric redshift catalogue, in the redshift ranges: 0.007 ≤ z ≤ 0.074, 0.124 ≤ z ≤ 0.177, and 0.230 ≤ z ≤ 0.274. Star symbols show the galaxies in the star-forming region defined in panel a). We discarded galaxies with high Hα and low [OIII] emission. A subregion (darker shadow) shows the loci in which the photometric EW in Hα and [OIII] is larger than 80 Å for the photometric sample.